International Research Journal of Engineering and Technology (IRJET)
e-ISSN: 2395-0056
Volume: 12 Issue: 04 | Apr 2025
p-ISSN: 2395-0072
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Power Quality Improvement through Multi-Level Cascaded H-Bridge Inverter Design Shivam Singh1, Sakshi singh baghel2, Shivam Singh3 1 Assistant Professor, Dept. of Electrical Engineering, Srkcesm, Satna, Madhya Pradesh, India 2Dept. of Electrical Engineering, Srkcesm, Satna, Madhya Pradesh, India
3Dept of Electrical Engineering, Srkcesm, Satna, Madhya Pradesh, India ---------------------------------------------------------------------***---------------------------------------------------------------------
Abstract - The present study focuses on the design and
reliability. As the demand for distributed generation grows, especially with renewable energy integration, there is a pressing need for advanced grid operation and management techniques.
performance evaluation of a 7-level cascaded H-Bridge multilevel inverter. Multilevel inverters are widely used in high-power and low total harmonic distortion (THD) applications, making them ideal for various energy distribution and control systems. In this work, a simulation model of a cascaded H-Bridge inverter is developed using MATLAB/SIMULINK. The simulation aims to assess the key performance metrics of the inverter, including output voltage waveform, total harmonic distortion, harmonic spectrum, and voltage stress across the power devices. The 7-level configuration enhances the quality of the output waveform by reducing harmonic distortion and improving voltage resolution. The simulation results demonstrate that this topology provides an efficient and reliable solution for power conversion in medium to high-power applications. Through this study, the potential of cascaded H-Bridge inverters in delivering high-quality power with reduced harmonic content is effectively illustrated.
Globally, installed capacities of solar and wind energy have reached impressive levels—India alone has achieved 42.8 GW of solar and 37.5 GW of wind power, while Sri Lanka has surpassed 100 MW and 367 MW respectively. Technologies such as CHB inverters are ideal for medium to high-power applications including motor drives, power conditioning, and reactive power compensation. These inverters offer sinusoidal outputs, even without additional filters, and work effectively across resistive (R), inductive (RL), and capacitive (RLC) loads. However, challenges such as voltage balancing, circuit complexity, and the requirement for isolated DC sources at each level must be addressed for optimal performance.
2. Motivation
Key Words: Power quality, Smart grid, Renewable energy MATLAB Simulink, Multilevel inverter etc.
The review of multilevel inverter technology is driven by its growing importance in the future of renewable energy systems, especially in solar and standalone solar applications. Multilevel inverters are known for their ability to significantly reduce harmonic distortion, leading to cleaner and more stable power output. This makes them an ideal solution for improving power quality in renewable setups.
1.INTRODUCTION Renewable energy sources such as solar and wind are abundantly available and are rapidly becoming central to sustainable power generation worldwide. However, to ensure high reliability and improved power quality from these sources, innovative control strategies are essential. Among them, the use of multilevel inverter technologies has gained significant attention.
In particular, integrating multilevel inverter systems with solar energy in rural areas can ensure reliable and highquality electricity supply. These systems not only enhance efficiency but also provide uninterrupted power, making them highly suitable for remote regions where consistent energy access is crucial.
Solar and wind energy have seen exponential growth in recent years. Solar photovoltaic (PV) systems generate DC power, which must be converted to AC using inverters. A novel approach using multilevel inverters, specifically cascaded H-Bridge (CHB) inverters, is employed to reduce harmonic distortion and enhance output waveforms without the need for complex filters.
3. H-Bridge Inverter Traditional two- or three-level inverters are often unable to completely eliminate unwanted harmonics in the output waveform. To address this limitation, researchers are exploring the use of multilevel inverter architectures as a potential alternative to conventional pulse-width modulation (PWM) inverters.
The proposed work focuses on connecting both wind and solar energy sources directly to the utility grid through a seven-level CHB inverter. Simulation studies conducted using MATLAB/Simulink demonstrate the effectiveness of this configuration in maintaining power quality and system
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